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CBSE Class 10 · Science · 24 past questions

6 of 24 · show all

1. Q3 2026

   In accumulation of toxic substances at higher trophic levels of an ecosystem through the food chain, which of…

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2. Q6 2026

   In the given figure, identify the trophic level having maximum concentration of harmful chemicals. (with a figure)

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3. Q17 2024

   Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings.…

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4. Q21 2024

   For Q. Nos. 17 to 20, two statements are given – One labelled as Assertion (A) and the other labelled as…

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5. Q23 2023

   How do harmful chemicals get accumulated progressively at each trophic level in a food chain ?

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6. Q24 2023

   Use of several pesticides which results in excessive accumulation of pesticides in rivers or ponds, is a…

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